Speed-changing mechanism.



PATENTED APR 26, 1904.

0. J. REED. SPEED CHANGING MECHANISM.

APPLICATION FILED SEPT.15. 1903.

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UNITED STATES Patented April 26, 1904.

PATENT OFFICE.

CHARLES J. REED, OF PHILADELPHIA, PENNSYLVANIA, ASSIGNOR TO REED-MORRILL ELECTRIC CO., A CORPORATION OF PENNSYLVANIA.

SPEED-CHANGING MECHANISM.

SPECIFICATION forming part of Letters Patent No. 758,474, dated April 26, 1904. Application filed September 15, 1903. Serial No. 173,256. .(No model.)

I0 and whom it may concern.

Be it known that I, CHARLES J. REED, a citi- Zen of the United States, residing at Philadelphia, in the county of Philadelphia and State of Pennsylvania, have invented certain new and useful Improvements in Speed-Changing Mechanisms, of which the following is'a specification.

This invention is a mechanism for transmitting power from a driving to a driven shaft and enabling the speed of the driven shaft to be varied with reference to that of the drivingshaft.

The mechanism comprises a double pulley, which is placed between and bolted to pulleys on the driving and the driven shafts. The double pulley has two drums, each consisting of a set of radially-adjustable rim-sections and means for simultaneously moving either set of rim-sections inwardly and the other outwardly, thereby contracting one drum and expanding the other.

Referring to the accompanying drawings, Figure 1 is a plan view of the double pulley with the .parts at one side of a vertical axial plane in horizontal axial section. Fig. 2 is a transverse vertical section of the double pulley on the line 11 II of Fig. 1 with a portion broken away, and Fig. 3 is a transverse vertical section on the line III III of Fig. 1.

The pulley 1 is carried by a shaft 2, journaled in bearings 3, and has plural drums,

(shown as two in number,) each drum having movable rim-sections 4. The double pulley comprises three rim-Section-adjusting disks 5 6 7, which are keyed on a sleeve 8, revolubly supported on the shaft 2. The disks 5 6 are spaced apart to receive between them one set of rim-sections, and the disks 6 7 are spaced apart to receive between them the other set of rim-sections. The disks 5 6 7 have in their opposing faces spiral grooves 9. The grooves in the disks 5 7 are cut in a contra-clockwise direction from the center to the circumference. The grooves in both faces of the disk 6 are cut in a clockwise direction from the center to the circumference.

gear mechanism for adjusting the rim-sections. The plates 10 11 are rigidly secured on the flanged radially-slotted ends of a sleeve H, which is revolubly supported on the sleeve 8 between the adjusting-disks 5 6. The plates 12 13 are rigidly secured on the flanged radially-slotted ends of a sleeve 15, which is revolubly supported on the sleeve 8 between the adjusting-disks 6 7. The flange 10 of the plate 10 is secured to the corresponding flange 16 of a plate 16 outside the ad justing-disk 5 and keyed to the shaft 2. Each of the plates 10 ll 12 13 has a circular series of substantially radial equidistant slots 17, which receive and guide the ends of the rim-sections 4. Each of the rim-sections 4 consists of a straight bar with a broad belt-receiving surface and having at each end teeth 18,which lit the spiral grooves 9 of the adjusting-disks. The rim-sections are so constructed that the bearing-surfaces of the sections of each drum are equidistant from the axis of the pulley-shaft, notwithstanding the fact that each successive section enters the spiral groove at a somewhat greater distance from the center than the preceding section. ting the teeth 18 in different positions on the sections of each drum.

It will be seen that the guide-plates 10 ll 12 13 are rigidly connected together and to the shaft by the plate 16, flanges 16 10, sleeve 14, flanges 11 12, and sleeve 15, so that rotation of the sleeve 8, carrying the adjustingdisks on the shaft, causes the teeth of all the rim-sections to move spirally in the several grooves 9 and radially in the guide-slots 17. The rim-sections constituting one pulley-drum are thereby moved inwardly, decreasing the diameter of the drum, and the rim-sections of This result may be effected by cutthe other set are simultaneously moved outwardly, increasing the diameter of the other drum.

The rotation of the sleeve 8 on the shaft to adjust the drums may be effected by any desired mechanism. That shown comprises a gear 19, integral with the outer face of the adjusting-disk 7, and an engaging pinion 20, carried on the end of a shaft 21, which is revolubly mounted in a block 22, bolted to the flange 13 of the guiding-plate 13. The outer end of the shaft 21 carries a pinion 42, engag- .ing a worm 23, fixed on a shaft 24, which is also revolubly mounted in the block 22. The inner end of the shaft 24 carries a bevel-pinion 25. Revolubly mounted on the projecting end of the pulley-shaft 2 is a sleeve 26, on the ends of which are keyed two bevel-gears 27 28, one at each side of the bevel-pinion 25. A pivoted hand-lever 29, having a spring-pressed detent 30, engages eyes 31, projecting from the outer face of gear 28. The hand-lever serves to shift the sleeve 26 on the shaft 2 and to bring either bevel-gear 27 or 28 into engagement with the pinion 25. When the detent 30 of the hand-lever is in engagement with the middle notch 32 of the arm 33, both gears 27 28 are held out of engagement with the pinion 25. When the lever is thrown to the left and the detent engages the notch 34, the gear 27 is thrown into mesh with the pinion 25, thereby rotating the worm 23, pinions 42 and 20, and finally the gear 19, and thereby the three adjusting-disks. The simultaneous rotation of these three disks relatively to the four guiding-disks simultaneously moves the rim-sections of one pulley-drum inwardly, decreasing the diameter of the drum, and the rim-sections of the other drum outwardly, increasing its diameter. When the two drums have been adjusted to give the desired speed, the hand-lever is again thrown to its middle position. Movement of the hand-lever in the otherdirection until the detent 30 engages the notch 35 brings the bevel-gear 28 into engagement with the pinion 25, thereby rotating the adjusting-disks in the opposite direction.

Various changes may be made in the mechanism shown and described. The sleeve carrying the adjustingdisks may be rotated by various devicesfor example, those claimed in my applications, Serial No. 164,523, filed July 7, 1903, or Serial No. 167,450, filed July 29, 1903. The belt-receiving surface of the rim-sections may be convex or concave. The guide-slots need not be radial, provided they cross the spiral grooves, and they may be slightly curved instead of straight. The spiral grooves may be of different form and pitch from those shown. The pulley may have more than two drums, and the adjusting-disks may be grooved to effect any desired adjustment of the rim-sections of the several drums.

I claim- 1. A pulley having plural drums, each drum having movable rim-sections, a tube revolublymounted on the pulley-shaft, and three adjusting-disks fixed on said tube, as set forth.

2. A pulley having plural drums, each drum having movable rim-sections, a tube revolubly mounted on the pulley-shaft, and three adjusting-disks having spiral grooves and fixed on said tube, as set forth.

3. Apulley having pluraldrums, each drum having movable rim-sections, a tube revolubly mounted on the pulley-shaft, three adjusting-disks having spiral grooves and fixed on said tube, and means for rotating said tube on said shaft, as set forth.

4. Apulley having plural drums, each drum having movable rimsections, three adjustingdisks revolubl y supported on the pulley-shaft, and four guiding-plates rigidly connected to said shaft, as set forth.

5. Apulley having plural drums, each drum having movable rim-sections, three spirallygrooved adjusting-disks revolubly supported on the pulley-shaft, and four guiding-plates rigidly connected to said shaft and having slots crossing said spiral grooves, as set forth.

6. Apulley having plural drums, eachdrum having movable rim-sections, a tube revolubly mounted on the pulley-shaft and carrying three adjusting-disks, and guiding-plates rigidly connected to said shaft, the guiding-plates of each drum being carried on the'ends of a sleeve revolubly supported on said tube between two of said adjusting-disks, as set forth.

7. Apulley having pluraldrums, each drum having movable rim-sections, a tube revolubly supported on the pulley-shaft and carrying three adjusting-disks, and guiding-plates rigidly connected to said shaft, the guidingplates of each drum being carried on the ends of a sleeve revolubly supported on said tube between two of said adjusting-disks and the adjacent guiding-plates of the two drums being rigidly connected together at their periph eries, as set forth.

8. Apulley having plural drums, each drum having movable rim-sections, a tube revolubly mounted on the pulley-shaft and carrying three adjusting-disks having spiral grooves which engage the ends of each rim-section, guidingplates having substantially radial guide-slots for said rim-sections, the guidingplatcs of each drum being carried on the ends of a sleeve revolubly supported on said tube between two of said adjusting-disks and the adjacent guiding-plates of the two drums being rigidly connected together at their peripheries, and a plate fixed on the pulley-shaft and rigidly connected at its periphery to one of said guiding-plates, as set forth.

9. A pulley having plural drums, each drum having movable rim-sections, a tube revolutube on said shaft, as set forth.

11. A pulley having plural drums, each drurn having movable rim-sections, a tube revolubly mounted on'the pulley-shaft, a disk having adj usting-grooves in its opposite faces and fixed on said tube, and guiding-plates rigidly connected at their peripheries and inclosing I 5 said adjusting-disk, as set forth.

In testimony whereof I have signed my name to this specification in the presence of two subscribing Witnesses.

CHARLES J. REED.

Witnesses:

RoB'r. B. FLETCHER, JAMES W. LAWs. 

